[BobM]

On many power conditioners, like the Quiet Line filters, or the Felicia, there are small capacitors (.01uF - 1.0uF) and sometimes a varistor across the line. I would assume that there is a constant draw of power running through them, unless there's a power switch turned off in front of them.

What kind of draw are we talking about here? With energy prices getting higher and higher is it worthwhile to unplug these when not in use or are we talking pennies a year?

Just curious,
Bob

[Occam]

'X' and 'Y' caps dissipate watts only via their ESR, equivalent series resistance, not via their reactive component of impedance....
Long answer short, unless the caps are really crappy, or there is resistance in series with those caps (for damping purposes), they're not going to increase your residential electric bill by squat.
For industrial consumers, who are charged for both Watts and VA, caps typically lower bills as they bring the power factor back toward 1, compensating for the typical, highly inductive loads of electric motors.

[95Honda]

I don't know about the rest, but the quiet lines have a large value resistor in parellel with the filter just to bleed off any voltage after you remove it from the socket, this was a saftey precaution.  It is high enough in resistance that it never will draw anything that you would ever notice or should worry about.

If the other filters use similar "Line Rated" film caps, unless you put a few hundred together in parellel, they don't draw hardly anything in the 50-60Hz range.